def test_mine_block():
previous_block = Block.generate_genesis()
data = '123'
next_block = Block.mine_block(previous_block, data)
assert isinstance(next_block, Block)
assert next_block.data == data
assert previous_block.hash == next_block.previous_hash
assert hex_to_binary(next_block.hash).startswith('0' *
next_block.difficulty)
def is_valid_chain(chain):
"""
Checks if incoming chain is valid
"""
if chain[0] != Block.generate_genesis():
raise Exception('First block must be genesis block')
for i in range(1, len(chain)):
block = chain[i]
previous_block = chain[i - 1]
if block.previous_hash != previous_block.hash or not Block.is_valid_proof(
block, block.hash):
return False
return True
def test_generate_hash():
block = Block.generate_genesis()
assert generate_hash(block) == generate_hash(block)
assert generate_hash(
block
) == 'a65ae033a322f80df233c856ae2cbb2677b16a69eebeda4c95b3cea25a86092d'
def test_genesis_block():
genesis_block = Block.generate_genesis()
assert isinstance(genesis_block, Block)
for k, v in GENESIS_DATA.items():
assert getattr(genesis_block, k) == v
def __init__(self):
"""
Initializes list to store blocks
"""
self.chain = [Block.generate_genesis()]